<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      background: url(./images/desktop_1.jpg) no-repeat top center/cover;
    }
  </style>
</head>

<body>
  <script>
    
    // 要求：每次刷新，随机显示背景图片，图片范围desktop_1.jpg~desktop_10.jpg
    // console.log(document.body)
    const body = document.body
    // 取到 N ~ M 的随机整数
    function random(N,M){
      return Math.floor(Math.random()*(M-N+1)+N)
    }
    // 随机数
    const num = random(1,10)
    // 修改body的背景样式
body.style.backgroundImage = `url(./images/desktop_${num}.jpg)`











  </script>
</body>

</html>